Definition

1. Adjective:

   • Occurring every two years: Describes an event, meeting, or publication that happens once every second year.
   • Lasting for two years: Describes something with a duration of two years.
   • (Botany) Having a life cycle of two years: Describes a plant that typically takes two growing seasons to complete its life cycle, from germination to seed production and death.

2. Noun:

   • (Botany) A biennial plant: A plant, such as a carrot or parsley, that completes its life cycle over two years, usually flowering and fruiting in the second year.

Examples of Usage

• Adjective:

  • The company holds a biennial conference for all its international partners.
  • The festival is a biennial event, so we'll have to wait until next year to attend again.
  • Parsley is a biennial herb, but it is often harvested in its first year.

• Noun:

  • Carrots are a common biennial grown in vegetable gardens.
  • Many biennials require a period of cold weather to trigger flowering in their second year.

Advanced Usage

• "Biennial basis": Used to describe the regular two-year interval of an occurrence.

  • The report is published on a biennial basis.

• "Biennial review": An assessment or evaluation conducted every two years.

  • The department undergoes a mandatory biennial review of its procedures.

Variants and Related Words

• Biennially (adverb): Happening every two years.

  • The committee meets biennially.

• Biennium (noun): A period of two years.

  • The budget is planned for the next biennium.

Synonyms

• Bi-yearly (Note: This can be ambiguous as it sometimes means "twice a year"; "biennial" is more precise for "every two years").
• Two-year (as in a two-year cycle).
• For plants: Two-year plant.

Antonyms

• Annual (occurring every year; a plant with a one-year life cycle).
• Perennial (lasting or recurring for many years; a plant with a life cycle of more than two years).

Common Confusions

• Biennial vs. Biannual: A frequent point of confusion. Biennial means "every two years." Biannual means "twice a year" (synonymous with semiannual).

Adjective

1. occurring every second year
   • they met at biennial conventions
2. having a life cycle lasting two seasons
   • a biennial life cycle
   • parsnips and carrots are biennial plants often grown as annuals

Noun

1. (botany) a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season